AQL: Add builtin functions introduced in v3.12 (#968)

New functions added to 3.12.0 (`PARSE_COLLECTION()`, `PARSE_KEY()`,
`RANDOM()`, `REPEAT()`, `TO_CHAR()`) and the current stand for the
upcoming 3.12.1 (`ENTRIES()`).

Some functions were also removed (`CALL_GREENSPUN()`, `PREGEL_RESULT()`)
but I think it makes sense to keep them in the definition so that
highlighting older queries still works.

lexers/embedded/arangodb_aql.xml

@@ -152,7 +152,7 @@
       <rule pattern="(?-i)(?:CURRENT|NEW|OLD)\b">
         <token type="NameBuiltinPseudo"/>
       </rule>
-      <rule pattern="(?:to_bool|to_number|to_string|to_array|to_list|is_null|is_bool|is_number|is_string|is_array|is_list|is_object|is_document|is_datestring|typename|json_stringify|json_parse|concat|concat_separator|char_length|lower|upper|substring|substring_bytes|left|right|trim|reverse|contains|log|log2|log10|exp|exp2|sin|cos|tan|asin|acos|atan|atan2|radians|degrees|pi|regex_test|regex_replace|like|floor|ceil|round|abs|rand|sqrt|pow|length|count|min|max|average|avg|sum|product|median|variance_population|variance_sample|variance|percentile|bit_and|bit_or|bit_xor|bit_negate|bit_test|bit_popcount|bit_shift_left|bit_shift_right|bit_construct|bit_deconstruct|bit_to_string|bit_from_string|first|last|unique|outersection|interleave|in_range|jaccard|matches|merge|merge_recursive|has|attributes|keys|values|unset|unset_recursive|keep|keep_recursive|near|within|within_rectangle|is_in_polygon|distance|fulltext|stddev_sample|stddev_population|stddev|slice|nth|position|contains_array|translate|zip|call|apply|push|append|pop|shift|unshift|remove_value|remove_values|remove_nth|replace_nth|date_now|date_timestamp|date_iso8601|date_dayofweek|date_year|date_month|date_day|date_hour|date_minute|date_second|date_millisecond|date_dayofyear|date_isoweek|date_isoweekyear|date_leapyear|date_quarter|date_days_in_month|date_trunc|date_round|date_add|date_subtract|date_diff|date_compare|date_format|date_utctolocal|date_localtoutc|date_timezone|date_timezones|fail|passthru|v8|sleep|schema_get|schema_validate|shard_id|version|noopt|noeval|not_null|first_list|first_document|parse_identifier|current_user|current_database|collection_count|pregel_result|collections|document|decode_rev|range|union|union_distinct|minus|intersection|flatten|is_same_collection|check_document|ltrim|rtrim|find_first|find_last|split|substitute|ipv4_to_number|ipv4_from_number|is_ipv4|md5|sha1|sha256|sha512|crc32|fnv64|hash|random_token|to_base64|to_hex|encode_uri_component|soundex|assert|warn|is_key|sorted|sorted_unique|count_distinct|count_unique|levenshtein_distance|levenshtein_match|regex_matches|regex_split|ngram_match|ngram_similarity|ngram_positional_similarity|uuid|tokens|exists|starts_with|phrase|min_match|bm25|tfidf|boost|analyzer|offset_info|value|cosine_similarity|decay_exp|decay_gauss|decay_linear|l1_distance|l2_distance|minhash|minhash_count|minhash_error|minhash_match|geo_point|geo_multipoint|geo_polygon|geo_multipolygon|geo_linestring|geo_multilinestring|geo_contains|geo_intersects|geo_equals|geo_distance|geo_area|geo_in_range)(?=\s*\()">
+      <rule pattern="(?:to_bool|to_number|to_char|to_string|to_array|to_list|is_null|is_bool|is_number|is_string|is_array|is_list|is_object|is_document|is_datestring|typename|json_stringify|json_parse|concat|concat_separator|char_length|lower|upper|substring|substring_bytes|left|right|trim|reverse|repeat|contains|log|log2|log10|exp|exp2|sin|cos|tan|asin|acos|atan|atan2|radians|degrees|pi|regex_test|regex_replace|like|floor|ceil|round|abs|rand|random|sqrt|pow|length|count|min|max|average|avg|sum|product|median|variance_population|variance_sample|variance|percentile|bit_and|bit_or|bit_xor|bit_negate|bit_test|bit_popcount|bit_shift_left|bit_shift_right|bit_construct|bit_deconstruct|bit_to_string|bit_from_string|first|last|unique|outersection|interleave|in_range|jaccard|matches|merge|merge_recursive|has|attributes|keys|values|entries|unset|unset_recursive|keep|keep_recursive|near|within|within_rectangle|is_in_polygon|distance|fulltext|stddev_sample|stddev_population|stddev|slice|nth|position|contains_array|translate|zip|call|apply|push|append|pop|shift|unshift|remove_value|remove_values|remove_nth|replace_nth|date_now|date_timestamp|date_iso8601|date_dayofweek|date_year|date_month|date_day|date_hour|date_minute|date_second|date_millisecond|date_dayofyear|date_isoweek|date_isoweekyear|date_leapyear|date_quarter|date_days_in_month|date_trunc|date_round|date_add|date_subtract|date_diff|date_compare|date_format|date_utctolocal|date_localtoutc|date_timezone|date_timezones|fail|passthru|v8|sleep|schema_get|schema_validate|shard_id|version|noopt|noeval|not_null|first_list|first_document|parse_identifier|parse_collection|parse_key|current_user|current_database|collection_count|pregel_result|collections|document|decode_rev|range|union|union_distinct|minus|intersection|flatten|is_same_collection|check_document|ltrim|rtrim|find_first|find_last|split|substitute|ipv4_to_number|ipv4_from_number|is_ipv4|md5|sha1|sha256|sha512|crc32|fnv64|hash|random_token|to_base64|to_hex|encode_uri_component|soundex|assert|warn|is_key|sorted|sorted_unique|count_distinct|count_unique|levenshtein_distance|levenshtein_match|regex_matches|regex_split|ngram_match|ngram_similarity|ngram_positional_similarity|uuid|tokens|exists|starts_with|phrase|min_match|bm25|tfidf|boost|analyzer|offset_info|value|cosine_similarity|decay_exp|decay_gauss|decay_linear|l1_distance|l2_distance|minhash|minhash_count|minhash_error|minhash_match|geo_point|geo_multipoint|geo_polygon|geo_multipolygon|geo_linestring|geo_multilinestring|geo_contains|geo_intersects|geo_equals|geo_distance|geo_area|geo_in_range)(?=\s*\()">
         <token type="NameFunction"/>
       </rule>
       <rule pattern="&#34;">